Method of effecting the precipitation of flue-dust in blast-furnaces and of preventing the formation of the same.



R. W. H. ATOHERSON & W. SIDDALL. METHOD OF .EFPEGTING THE PRECIPITATION0F PLUE DUST IN BLAST FURNACES AND OF PREVENTING THE FORMATION OF THESAME. APPLIOATION FILED mm; 12, 1905.

912,641. Patented Feb. 16, 1909.

UNITED STATES PATENT OFFICE.

RALPH W. H. ATOHERSON AND WILLIAM SIDDALL, OF BELLAIRE, OHIO.

METHOD OF EFFECTING THE PRECIPITATION OF FLUE-DUST IN BLAST-FURNACES ANDOF PREVENTING THE FORMATION OF THE SAME.

Application filed June 12,

To all whom it may concern:

Be it known that we, RALPH W. H. A'roHnnsoN and l/VILLIAM SIDDALL,citizens of the United States of America, and residents of Bellaire,county of Belmont, and State of Ohio, have invented certain new anduseful Improvements in Methods of Effecting the Precipitation of Flue-Du st in Blast-Furnaces and of Preventing the Formation of the Same,of which the following is a specification.

Our invention relates to a novel method whereby dust and other particlesof solid matter are prevented from issuing from a blast furnace and thelike with the gas which is generated therein; and said method consistsin introducing within the gas zone or the path of travel of the gas anopposing force sufficient to overcome the momentiun of the said dust orsolid matter which is carried in suspension and cause it to remain inthe furnace. The opposing force referred to may be in the formfof gas,water, or steam, and is adapted to precipitate such dust particles orsolid matter as has a tendency to rise with the furnace gas, and also toprevent, to a great extent, the tendency of such dust, particles of rawmaterial, or solid matter to rise with said furnace gas.

In describing our said method in detail, reference is herein had to theaccompanying drawing, forming part of this specification, in which thefigure is a vertical section of the top of a blast-furnace stack,illustrating, also in vertical section, one of various means which mightbe employed for carrying out our said method.

In said drawing, 1 indicates the wall of the stack, 2 the canopy-liketop thereof, and 3 the movable bell, all of a usual or ordinaryconstruction, while 4 indicates the bed of raw material in the furnace,and 5 the gas zone.

Patented Feb. 16, 1909.

1905. Serial No. 264,807.

At a suitable point above the raw-material bed 4: preferably directlybeneath the bell 3, is mounted in a suitable manner a perforated pipe 6,preferably circular in form, the per forations 7 of which are sodirected as to have within their range the whole of the gas zone 5.Connected with the perforated pipe 6 is a pipe 8 leading from a suitablesource of supply of gas, water, or steam, preferably the latter. Thegas, water, or steam, as the case may be, is discharged under pressurethrough the perforations 7 with sufiicient force to overcome themomentum of the dust particles or solid matter carried in suspension bythe gas arising from the raw material and to cause its precipitation.Further, when Water or steam is employed as the opposing agent, it has atendency to prevent dust from arising from the bed of raw material withthe gas.

As is obvious, our method may be employed in the gas mains as well as inthe top of the furnace, and the result will be precisely the same.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is

The method of precipitating dust or solid matter from the furnace gas ofblast furnaces and the like, which consists in directing throughout thewhole of the gas zone of the furnace jets of a dust-dampening agentunder high pressure for dampening the fuelbed and for overcoming themomentum of such dust-particles as are carried in suspension by saidgas.

Signed by us in the presence of two subscribing witnesses.

] RALPH W. H. ATOHERSON.

WVILLIAM SIDDALL. WVitnesses:

H. E. DUNLAP, Rosa. F. DILWORTH.

